Grundfos 98420224 Comfort PM AutoAdapt Recirculation Pump NPSM, 1 1/4-Inch Three modes: AutoAdapt, temperature, and 100% AutoAdapt mode learns and adapts to consumption patterns ECM permanent magnet motor Head, max: 3.9-Feet 115V, Auto, Check valve, 1-1/4" NPSM union, 6ft. line cord (ISO valve)